General Operation
38
VTM-2400 Installation and Operation Handbook
Nordic
DIN 45406
dBFS (Digital only)
Zero Ref dBFS (ref –20 dBFS) (Digital only)
Vertical Audio Displays
The Vertical Meter displays the level and reference in a vertical format. There are four analog
audio input channels (two stereo pairs), four AES/EBU digital input channels (four stereo
pairs), and 16 embedded audio channels (eight stereo pairs) available for selection in the
menu. A maximum of four channels can be displayed simultaneously. Audio inputs can be
assigned to any meter pair on the display.
The displayed inputs can also be monitored as analog signals on the 37-pin, D-Sub, ANALOG
INPUT/OUTPUT connector. The displayed AES/EBU or embedded audio will be converted to
analog audio for the monitoring output. The output audio level can be adjusted from -50 dB
to +6 dB around the reference-input level. The default output level for a -20 dBFS input
produces a +4 dBm analog output level (600
Ω
). For example, when applying a gain
adjustment of +6 dB to the output with a -20 dBFS input signal, the audio output level will be
+10 dBm into a 60
0Ω termination
. This Audio Output Level adjustment is made in the AUDIO
SETUP\OUTPUT PREFERENCES menu. The Audio Output Level adjustment default is 0 dB.
The phase bars are used to monitor the instantaneous phase relationship between two
channels of audio. The “+” marking indicates a phase difference of 0°, and the “-” marking
indicates a phase difference of 180°. A properly phased stereo pair produces a phase pointer
that moves within the green zone, whereas a reversed channel produces a pointer that moves
within the red zone. The phase bar polarity in the AUDIO SETUP\METER SETUP\CONFIGURE
PHASE BARS\POLARITY menu can be set to Normal or Reverse.
The effect of higher damping in a phase meter is to show an averaged rather than a peak
value of phase. The Phase Bar Damping in the AUDIO SETUP\METER SETUP\CONFIGURE
PHASE BARS\DAMPING can be set from FAST, 1 to 10, and SLOW.
The lissajous display appears for 2 and 4 bar graphs on the right of the audio pane. The
lissajous display shows the amplitude and phase relationship between two input signals.
Vertical Audio display diagrams are shown in
Figure 3-21
to
Figure 3-22
and described in
Table 3-14
to
Table 3-15
. The Vertical audio graticule scales change according to the scale
selections made in the Setup menu and the format being displayed. Some of the markings in
the illustrations do not normally appear on the display.
